Mower blade system

ABSTRACT

The mower blade system provides one or more blades, preferably two, secured to a housing that is attached to the mower. The blades provide a cutting edge that is sharpened for mowing the yard, lawn, field, or other area. The blade attaches to an attachment arm via a locking body and retention body. A pivot aperture of the blade is placed upon a pivot finger of the attachment arm that secures the blade on the attachment arm. The locking body abuts the pivot finger to secure the blade on the pivot finger. The retention body then slides over the locking body to further secure the blade on the pivot finger.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to and is a continuation in part ofU.S. patent application Ser. No. 14/704,882 entitled MOWER BLADE SYSTEMfiled on May 5, 2015 which is a continuation in part of U.S. PatentApplication No. 61/988,768 entitled MOWER BLADE SYSTEM filed on May 5,2014.

STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT

Not Applicable.

REFERENCE TO A MICROFICHE APPENDIX

Not Applicable.

RESERVATION OF RIGHTS

A portion of the disclosure of this patent document contains materialwhich is subject to intellectual property rights such as but not limitedto copyright, trademark, and/or trade dress protection. The owner has noobjection to the facsimile reproduction by anyone of the patent documentor the patent disclosure as it appears in the Patent and TrademarkOffice patent files or records but otherwise reserves all rightswhatsoever.

BACKGROUND OF THE INVENTION Field of the Invention

The present invention relates generally to a mower blade system withreplaceable blades secured within a housing attached to the mower. Themower blade system enables a user to quickly and conveniently remove theblades and install a blade as needed. The user may also turn over theblade to provide a new sharp edge on the cutting side.

Rotary mowers have a blade that rotates about a central point, typicallya spindle. The end sections of the blade are sharpened and are designedto cut, and sometimes mulch, the material which comes within the housingas the mower is moved over a grassy surface, e.g., a lawn.

Over time, the blades contact rocks, sticks, concrete, and other hardobjects that dull or damage the blades. The blades also wear and dullover time with use of the mower. The user must then replace the bladesto achieve a better mowed lawn. The known art requires a user to exert agreat amount of effort and time to replace the blades. The blades of thepresent invention are easily replaceable. Thus, the present inventionsaves time and effort required to replace the blades.

Description of the Known Art

Patents and patent applications disclosing relevant information aredisclosed below. These patents and patent applications are herebyexpressly incorporated by reference in their entirety.

U.S. Pat. No. 6,205,755 issued to Bontrager, et al. on Mar. 27, 2001(“the '755 patent”) teaches a blade that is secured to a blade adapterwhich is dimensioned to receive a fixed adapter. The fixed adaptertaught by the '755 patent is connected to the engine drive shaft of arotary mower. The blade and fixed adapter taught by the '755 patent areprovided with cooperating surfaces which permit the adapters to beselectively locked together and separated from each other withoutrequiring tools.

U.S. Publication No. 20080277127 to Dixon on Nov. 13, 2008 (“the '127publication”) teaches an improved rotary mower blade in which a carrierwhich is rotatably connect to a spindle driven by the mower engine,receive and holds a pair of opposed sharpened cutting segments. Thecutting segments taught by the '127 publication are held in place whilethe carrier is rotated, and are removable and replaced as needed whenthe carrier is stationary.

SUMMARY OF THE INVENTION

The present invention provides a mower blade system having one or moreblades, preferably two, secured to a housing such as an attachment armthat is attached to the mower. The blades provide a cutting arm that issharpened for mowing the yard, lawn, field, or other area. A blockingbody of each blade prevents the blade from passing through the housing.As the mower is running, the blocking body of each blade prevents theblade from exiting the housing due to the centripetal force.

The housing of one embodiment provides a blocking body to contact theblocking body of the blade. In another embodiment, the opening of thehousing decreases in height wherein the height of the opening is lessthan the height of the blade. The change in height of the openingprevents the blade from passing through the housing.

The system also prevents the blade from exiting the housing through theother direction. A blocking finger may extend downward to contact theend of the blade. The blocking finger secures the end of the blade toprevent the blade from exiting the insertion side of the housing.

It is an object of the present invention to maintain the efficiency ofrotary mowers.

It is an object of the present invention to decrease maintenance time ofthe mower system.

It is also an object of the present invention to increase efficiency ofchanging the blade.

It is also an object of the present invention to quickly change thesharpened sections of a rotary blade to minimize down time.

It is also an object of the present invention to secure the blade withina housing. It is also an object of the present invention to provide ahousing that allows quick release of the blade while securing the bladewithin the housing.

It is also an object of the present invention to simplify the process ofreplacing blades.

It is also an object of the present invention to maintain sharp bladeson a mower to improve the overall lawn and provide a better cut.

It is also an object of the present invention to provide a low costalternative to the requirement for additional couplers and adapters forchanging a blade.

It is also an object of the present invention to eliminate the need foradditional tools for changing the blades.

It is also an object of the present invention to provide a universalblade that may be secured to the mower.

It is also an object of the present invention to provide users withmower blades that can be replaced quickly, safely and in the field wherenecessary, thereby cutting down time and increasing efficiency atminimal cost.

These and other objects and advantages of the present invention, alongwith features of novelty appurtenant thereto, will appear or becomeapparent in the course of the following descriptive sections and theattached drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

In the following drawings, which form a part of the specification andwhich are to be construed in conjunction therewith, and in which likereference numerals have been employed throughout wherever possible toindicate like parts in the various views:

FIG. 1 is an environmental view showing one embodiment of the presentinvention;

FIG. 2 is a bottom perspective view of one embodiment thereof;

FIG. 3 is a bottom perspective view thereof;

FIG. 4 is a front view thereof, the rear view being a mirror image ofthe front view;

FIG. 5 is a top view thereof;

FIG. 6 is a top perspective view of one embodiment of the presentinvention;

FIG. 7 is a partial top perspective view thereof;

FIG. 8 is a sectional view of one embodiment of the present invention;

FIG. 9 is a sectional view thereof;

FIG. 10 is a sectional view thereof;

FIG. 11 is a right side view thereof, the left side view being a mirrorimage of the right side view;

FIG. 12 is a sectional view thereof;

FIG. 13 is a top perspective view of one embodiment of the presentinvention;

FIG. 14 is a front view thereof; the rear view being a mirror image ofthe front view;

FIG. 15 is a top view thereof;

FIG. 16 is a left side view thereof, the right side view being a mirrorimage of the left side view;

FIG. 17 is a partial bottom view thereof;

FIG. 18 is a partial bottom perspective view thereof;

FIG. 19 is a partial bottom perspective view thereof;

FIG. 20 is a partial bottom perspective view thereof;

FIG. 21 is a front view of an attachment arm of one embodiment of thepresent invention, the rear view being a mirror image of the front view;

FIG. 22 is a bottom perspective view thereof;

FIG. 23 is a left side view thereof; the right side view being a mirrorimage of the left side view;

FIG. 24 is a bottom view thereof;

FIG. 25 is a top perspective view of a locking body of one embodiment ofthe present invention;

FIG. 26 is a left side view thereof; the right side view being a mirrorimage of the left side view;

FIG. 27 is a rear view thereof;

FIG. 28 is a top view thereof;

FIG. 29 is a front partial view of the attachment arm with locking bodyof one embodiment of the present invention; the rear view being a mirrorimage of the front view;

FIG. 30 is a bottom perspective view thereof;

FIG. 31 is a bottom view thereof;

FIG. 32 is a rear view of a blade of one embodiment of the presentinvention;

FIG. 33 is a top view thereof;

FIG. 34 is a top perspective view thereof;

FIG. 35 is a left side view thereof, the right side view being a mirrorimage;

FIG. 32A is a top view of a blade of one embodiment of the presentinvention;

FIG. 33A is a left side view thereof, the right side view being a mirrorimage of the left side view;

FIG. 34A is a front view thereof;

FIG. 35A is a top perspective view thereof;

FIG. 36 is a top perspective view of a retention body of one embodimentof the present invention;

FIG. 37 is a left side view thereof, the right side view being a mirrorimage of the left side view;

FIG. 38 is a top view thereof;

FIG. 39 is a rear view thereof;

FIG. 40 is a sectional view thereof;

FIG. 41 is a sectional view of one embodiment of the present invention;and

FIG. 42 is a sectional view thereof.

DETAILED DESCRIPTION

FIG. 1 shows an environmental view of one embodiment of the mower bladesystem 100. An attachment arm 112 secures to a spindle 116 to rotate theattachment arm 112 and blades 108, 110. The same blade works very wellin a variety of commercial rotary mowers. The blades and attachment armmay be available in different sizes for attachment to different sizesand types of mowers. It is preferred that the blade and attachment armare constructed from a metal.

Retention bodies 104, 106 located at each end of the attachment arm 112accept blades 108, 110. Each retention body 104 provides a retentionaperture within the retention body 104, 106 that allows partial passageof the blades 108, 110 through the neck 104, 106. The blades 108, 110are inserted head first into the necks 104, 106. The blades 108, 110increase in height around the base of the blade 108, 110. The increasein height of the blade 108, 110 at the base prevents the blade 108, 110from completely passing through the retention bodies 104, 106.

Referring to FIG. 2, the mower blade system 100 includes an attachmentarm 112. The spindle 116 attached to a motor rotates the attachment arm112 and blades 108, 110 to cut the grass with blades 108,110. Thespindle 116 is driven by the motor, either directly or indirectly,through a belt system, depending on the mower unit. An attachmentaperture 118 of the attachment arm 112 receives spindle 116. A fastener114 secures the attachment arm 112 within the deck of the mower 102 atspindle 116.

The blades 108, 110 are removably seated at the remote ends of theattachment arm 112. The blades 108, 110 are held in place along thelongitudinal axis of the attachment arm 112 by the retention bodies 108,110 at the remote ends. Each blade 108, 110 includes a sharpened edge122, 124. The blade may be designed such that each edge of the blade hasa sharpened edge 122, 124 to allow the blade to be installed in eitherdirection. The sharpened edge 122 starts at the head of the blade 108,110 and ends towards the base of the blade 108, 110. The blades with twosharpened edges enable the user to install the blade with either edge asa lead cutting edge. Such capability increases the life of the blade asthe blade provides two sharpened edges for use instead of one.

As shown in FIGS. 2 and 3, the blades 108, 110 are inserted intoretention bodies 104, 106. The height in the openings of the retentionbodies 104, 106 decreases outwards from the central portion of theattachment arm 112. The blade 108, 110 increases in height toward thebase such that the increased height of the blade does not allow passageof the blade through the opening in retention bodies 104, 106.

As the attachment arm 112 rotates, centrifugal forces act on the blades108, 110. The increased height section of the blades 108, 110 locatedtowards the base securely wedges the blades 108, 110 within theretention bodies 104, 106. The sharpened edges of the blades 108, 110and blades 108, 110 remain securely in cutting position and cut asthough the blade were a single one piece unit.

Once the blade stops rotating, the blades 108, 110 are readily removedfrom the attachment arm 112. The blades 108, 110 may be replaced withnew blades. Because each blade provides two sharpened edges, the bladesmay be turned over and installed to place the opposite edge into acutting position.

FIGS. 2-5 and 11-12 show the installation of the blades 108, 110 intothe attachment arm 112. The head of the blade is inserted into anentrance of the retention body 104, 106 located on a first side of theretention body 104, 106. The blade 108, 110 exits the retention body104, 106 at the second side of the retention body 104, 106 at the exit.The exit of the retention body 104, 106 is located outward from theentrance of the retention body 104, 106. After the blade 108, 110 isinstalled into the retention body 104, 106, a locking finger 120, 126secures the base of the blades 108, 110 within the retention body 104,106. The locking finger 120, 126 prevents the removal of blades 108, 110from the retention body 104, 106. The locking finger 120, 126 will bedescribed in greater detail below with regards to FIGS. 8 and 9. Theheight of the opening in the retention bodies decreases from theentrance of the opening to the exit of the opening.

FIG. 6 shows another embodiment of the blade 128 and retention body 138.The blade 128 provides attachment apertures 130, 132 that accept afastener to secure the blade within the retention body 138. Attachmentapertures 140, 142 of retention body 138 also accept the fastener placedthrough attachment apertures 130, 132. Nuts 134, 136 secure the blade128 within the retention body 138.

FIG. 6 also shows another embodiment with a blocking body 146. Theblocking body 146 increases the height of the blade 144 to prevent theblade from passing completely through the retention body. The blockingbody 146 increases the height of the blade such that the blade cannotcompletely pass through the retention body.

FIG. 7 shows another embodiment of the blade 158 and retention body 148.Blade 158 provides two blocking bodies 160, 162. The blocking bodiescontact blocking bodies 152, 154 secured to the retention body 148within opening 156. The blocking bodies will be described in greaterdetail below.

FIGS. 7-9 provide additional information concerning locking fingers 120,126. Locking fingers 120, 126 are biased in a downward direction. As theblade 108 is installed into retention body 104, the locking finger 120is biased downwards to contact the base of blade 108. The contact of thelocking finger 120 blocks the blade 108 from movement in the reversedirection. Therefore, locking finger 120 prevents removal of the blade108 from the retention body 104.

To remove the blade 108, the user must depress locking finger 120. Thelocking finger 120 moves upward to unblock the blade 108 and allowremoval of the blade 108 from the retention body 104. In one embodiment,the locking finger is constructed from spring steel. The locking fingeris biased by a spring or other biasing mechanism. The locking finger 120is positioned on the attachment arm 112 so as to abut the blades 108,110 when the blades 108, 110 are in the cutting position. The lockingfinger 120, 126 inhibits the movement of blades 108, 110 from thesecured position until the locking finger 120, 126 is manuallydepressed.

FIG. 10 shows a sectional view of the blade 158 secured within retentionbody 148. The blade 158 provides multiple blocking bodies 160, 162, 164,168. The blocking bodies extend from both the top and the bottom of theblade 108. The blade may be constructed with one or multiple blockingbodies 160, 162, 164, 168. Similarly, the retention body 148 providesblocking bodies 152, 154, 166, 167. The blocking bodies 152, 154, 166,167 are located within opening 156. Blocking bodies 152, 167 extenddownward from the upper wall of the retention body 148. Blocking bodies154, 166 extend upward from the lower wall of the retention body 148.

The blade 158 is inserted into the opening 156 until blocking bodies160, 162, 164, and 168 of blade 158 contact blocking bodies 152, 154,166, 167 of retention body 148. The blades 158 extend outward from theattachment arm 112 to allow the cutting of the lawn. Locking finger 120adjusts downward to lock the blade into position due to the bias on thelocking finger 120.

FIGS. 13-16 show another embodiment of the present invention. The mowerblade system generally shown as 200 provides an attachment arm 202 thatattaches to the lawnmower. Attachment aperture 204 enables theattachment arm to attach to the lawnmower at the spindle. The attachmentaperture 204 enables the attachment arm 202 to attach to lawnmowerswithout reconfiguring the lawnmower. The attachment arm 202 attaches tothe lawnmower in a similar manner as existing lawnmower blades. Theblade system 200 retrofits with existing lawnmowers.

Retention bodies 206, 216 provide a retention aperture through which theattachment arm 202 passes through. The retention bodies 206, 216 slidelongitudinally on the attachment arm 202 for securing the blades 208,224 to attachment arm 202. Retention bodies 206, 216 adjust towards theends of attachment arm 202 to lock the blades 208, 224 into position.The retention fingers of retention bodies 206, 216 at least partiallyobstruct locking bodies 226, 228 to reduce movement of the lockingbodies 226, 228.

The blades 208, 224 are installed onto pivot fingers 210, 222. Theretention bodies 206, 216 adjust longitudinally towards the center ofattachment arm 202 to provide access to the pivot fingers 210, 222. Theuser vertically moves the locking finger 234 of locking bodies 226, 228to create space for installation of the blades 208, 224 onto attachmentarm 202. The blades 208, 224 are then placed on the pivot fingers 210,222 between the attachment arm 202 and the locking bodies 226, 228.Retention bodies 206, 216 are then adjusted longitudinally towards theends of attachment arm 202. The retention bodies 206, 216 at leastpartially cover the locking bodies 226, 228 to limit movement of thelocking bodies 226, 228. More specifically, the retention bodes 206, 216limit movement of the locking bodies 226, 228 away from the attachmentarm 202. The retention bodies 206, 216 maintain the positioning of thelocking bodies 226, 228 to secure the blades 208, 224 on the pivotfingers 210, 222. The blocking fingers 212, 214, 218, 220 limit movementof the blades 208, 224 as will be discussed below.

FIGS. 17-18 show the positioning of the retention body 206 in relationto locking body 226. Retention body 206 functions similarly to retentionbody 218 but on the other end of attachment arm 202. Retention bodies206, 218 adjust towards the ends of attachment arm 202 to at leastpartially cover locking bodies 226, 228 to secure the blades 208, 224between locking bodies 226, 228 and attachment arm 202. The centripetalforce caused by the rotation of attachment arm 202 on the lawnmowerforces retention bodies 206, 218 towards the ends of attachment arm 202The centripetal force maintains the retention bodies 206, 216 in thelocked position to secure the blades 208, 224 on attachment arm 202.

FIG. 18 shows the retention bodies 206, 216 adjusted to the lockedposition. FIGS. 19 and 20 show the retention bodies 206, 216 adjusted tothe unlocked position that allows movement of the locking bodies 226,228. Retention bodies 206, 216 slide towards the center of attachmentarm 202 away from the blades 208, 224, locking bodies 226, 228, andpivot fingers 210, 222 to adjust to the unlocked position. Oncepositioned in the unlocked position, retention bodies 206, 216 allowadjustment of locking bodies 226, 228. The user may then access pivotfinger 210, 222 to either install or remove blades 208, 224. The usermay then place the pivot aperture of the blades 208, 224 on the pivotfinger 210, 222 for installation of the blade 208, 224. The lockingbodies 226, 228 of one embodiment are located on the bottom ofattachment arm 202 for securing the blades 208, 224 to the bottom ofattachment arm 202. In another embodiment, locking bodies 226, 228 arelocated on the top of attachment arm 202 for securing the blades 208,224 to the top of attachment arm 202.

FIGS. 21-24 show the attachment arm 202. The attachment arm 202 providesattachment aperture 204 for securing the attachment arm 202 to thelawnmower. Pivot fingers 210, 222 extend vertically from the attachmentarm for securing the blades 208, 224 to the attachment arm 202. In oneembodiment, the pivot fingers 210, 222 extend vertically downward fromattachment arm 202 for securing the blades 208, 224 to the bottom of theattachment arm 202. In another embodiment, the pivot fingers 210, 222extend vertically upward to secure the blades to the top of theattachment arm.

Attachment arm 202 also provides multiple blocking fingers 212, 214,218, 220 that extend vertically in the same direction as the pivotfingers 210, 220. The blocking fingers 212, 214, 218, 220 are locatedlongitudinally more towards the center of attachment arm 202 than thepivot fingers 210, 220. Blocking fingers 212, 214, 218, 220 are alsolocated laterally to the sides of pivot fingers 210, 220.

Blocking fingers 212, 214, 218, 220 prevent the blades 208, 224 fromspinning around on the attachment arm 202. The blocking fingers 212,216, 218, 220 contact the blade to limit movement of the blades 208, 224if the blades should hit an object such as a rock or stump.

FIGS. 25-28 show the locking bodies 226, 228. Locking bodies 226, 228provide a base 230 for attachment to the attachment arm 202. Lockingfinger 234 extends longitudinally from the base 230. Locking neck 232extends vertically from the base 230 to provide for clearance of thepivot fingers 210, 222 and blocking fingers 212, 214, 218, 220 betweenthe locking finger 234 and the attachment arm 202 as shown in FIGS.29-31.

Base 230 of locking bodies 226, 228 secures to attachment arm 202.Locking bodies 226, 228 serve as a spring that limits clearance betweenthe pivot fingers 210, 222 and the locking bodies 206, 216. In oneembodiment, the locking bodies 226, 228 are constructed from springsteel.

FIGS. 32-35 show one embodiment of the blade 208. The blade 208 providesa pivot aperture 236 for securing the blade 208 within the space betweenattachment arm 202 and locking body 226, 228. Pivot fingers 210, 222 fitinto pivot apertures 236 of blades 208, 224 for securing the blades 208,224 to the attachment arm 202. The pivot aperture 236 is sized largeenough to accept the pivot finger 210, 222. In one embodiment, the pivotaperture 236 is larger than pivot finger 210, 222 to allow blade 208,224 to pivot on the pivot finger 210, 222. Enabling the blade to pivotreduces the possibility of breaking the blade should the blade strike arock, tree stump, stick, or other object. As discussed above, blockingfingers 212, 214, 218, 220 prevent the blade 208, 224 from spinningcomplete around on the pivot fingers 210, 222.

The blade 208, 224 provides a sharpened edge 238 for cutting the grass,weeds, lawn, etc. In one embodiment, the blade 208, 224 may provide asingle edge. In another embodiment, the blade 208, 224 may provide twosharpened edges. The user can remove the blade, flip the blade, andreattach the blade to pivot finger 210, 222. The user can then continuemowing with a sharpened blade due to the other edge being sharp. In oneembodiment, the edges are sharpened so that the cutting edge will remainthe same once the blade is flipped over and reattached.

FIGS. 32A-35A show another embodiment of the blade 300. Similar to blade208, blade 300 provides a pivot aperture 302 for installation of blade300 on the pivot fingers 210, 222 as discussed above. Blade 300 providesa first sharpened edge 304 and a second sharpened edge 306. Thesharpened edges 304, 306 provide two cutting surfaces. As one edgebecomes dull, the user may remove blade 300 from pivot finger 210, 222.The user adjusts the retention body to the unlocked position by movingthe retention body away from pivot finger 210, 222. The user thenvertically displaces the locking body 226, 228 and removes the blade 300from pivot finger 210, 222. The user can then turn the blade 300 over toprovide a second sharpened edge. The user then vertically displaces thelocking body 226, 228 and reinstalls the blade 300 onto pivot finger210, 222. The user can then adjust the retention body to the lockedposition by moving the retention body towards the pivot finger.

FIGS. 36-40 show the retention body 206 that is attached to theattachment arm 202. The retention body 206 adjusts along thelongitudinal axis of the attachment arm 202 for securing and releasingthe blades 208, 224 from pivot fingers 210, 222. A retention body 206,216 secures each blade 208, 224. Retention finger 242 extendslongitudinally across the locking body 226 as shown in FIGS. 17 and 18.

Retention aperture 240 extends longitudinally through the retention body206. The attachment arm 202 inserts longitudinally into retention body206 as shown in FIGS. 38 and 40. The retention aperture provides aninterior floor 244 and ceiling 246 within retention aperture 240. Theheight of the aperture varies in order to secure the locking bodies 226,228. The height of retention aperture 240 decreases along thelongitudinal axis of retention aperture 240. The height of retentionaperture 240 towards the blades 208, 224 is greater than the height ofthe retention aperture 240 away from the blades 208, 224. The height ofretention aperture 240 decreases at incline 248 along the longitudinalaxis towards the center of the attachment arm 202. The incline 248 ofthe retention bodies 206, 216 prevents blades 208, 224 and lockingbodies 226, 228 when attached to the attachment arm 202 from passingcompletely through retention aperture 240. Such attachment secures boththe retention bodies 206, 216 and the blades 208, 224 on attachment arm202.

FIGS. 41-42 show the retention bodies 206, 216 securing the lockingbodies 226, 228 and blades 208, 224. Pivot fingers 210, 222 extendvertically into the pivot aperture 236 of blades 208, 224. Lockingbodies 226, 228 abut the pivot fingers 210, 222 to reduce thepossibility of the blades 208, 224 from shaking loose from attachmentarm 202. Retention body 206, 216 extends longitudinally to the pivotfinger 210, 222 to further secure the blades 208, 224.

The present invention may provide different sized blades dependent onthe size of the mower. The blades may be sized for mowers that mow withblades of 16 inches, 18 inches, 19 inches, 20 inches, 21 inches, 22inches, 30 inches, 33 inches, 38 inches, 42 inches, 46 inches, 48inches, 50 inches, 54 inches, 60 inches, and other blade sizes. Becausethe mower system of one embodiment is constructed with two separateblades instead of a single blade, the size of each blade of the presentinvention may be shortened to provide the designated mowing area. Eachof the different sized blades may be designed to fit within anattachment arm. The attachment arm may be universally sized such thatthe different sized blades may be secured within the attachment arm.

In one embodiment, the size and shape of the attachment arm may vary tofit within different mowers. The shape may also be varied to securelyattach to the mower.

From the foregoing, it will be seen that the present invention is onewell adapted to obtain all the ends and objects herein set forth,together with other advantages which are inherent to the structure.

It will be understood that certain features and subcombinations are ofutility and may be employed without reference to other features andsubcombinations. This is contemplated by and is within the scope of theclaims.

As many possible embodiments may be made of the invention withoutdeparting from the scope thereof, it is to be understood that all matterherein set forth or shown in the accompanying drawings is to beinterpreted as illustrative and not in a limiting sense.

What is claimed is:
 1. A rotary mower blade system attachable to aspindle of a lawnmower, the system comprising: an attachment armextending along a longitudinal axis; a first retention body configuredto accept a blade; a retention aperture of the retention body wherein atleast a portion of the attachment arm passes longitudinally through theretention aperture of the retention body; a vertical height of theretention aperture that decreases along the longitudinal axis to limitmovement of the retention body along the longitudinal axis of theattachment arm; a blade that inserts into the retention aperture of theretention body to secure the blade to the attachment arm wherein boththe blade and the attachment arm are secured within the retentionaperture; a pivot finger extending vertically from the attachment arm,the pivot finger contacting the blade to secure the blade to theattachment arm; a locking body secured to the attachment arm; a lockingfinger of the locking body that is vertically displaced from theattachment arm, the locking finger extending longitudinally across thepivot finger such that the pivot finger is located between theattachment arm and the locking finger.
 2. The system of claim 1 whereinthe locking body is constructed from spring steel.
 3. The system ofclaim 1, the blade further comprising: a pivot aperture of the bladewherein the pivot finger passes vertically through the pivot aperture ofthe blade; the blade secured between the attachment arm and the lockingfinger wherein the pivot finger passes through the pivot aperture of theblade to secure the blade to the attachment arm, the locking fingercontacting the blade to secure the blade to the attachment arm.
 4. Arotary mower blade system attachable to a spindle of a lawnmower, thesystem comprising: an attachment arm extending along a longitudinalaxis; a first retention body configured to accept a blade; a retentionaperture of the retention body wherein at least a portion of theattachment arm passes longitudinally through the retention aperture ofthe retention body; a vertical height of the retention aperture thatdecreases along the longitudinal axis to limit movement of the retentionbody along the longitudinal axis of the attachment arm; a blade thatinserts into the retention aperture of the retention body to secure theblade to the attachment arm wherein both the blade and the attachmentarm are secured within the retention aperture; a pivot finger extendingvertically from the attachment arm, the pivot finger contacting theblade to secure the blade to the attachment arm; a locking fingersecured to the attachment arm, the locking finger vertically displacedfrom the attachment arm, the locking finger extending longitudinallyacross the pivot finger such that the pivot finger is located betweenthe attachment arm and the locking finger; a pivot aperture of the bladewherein the pivot finger inserts into the pivot aperture; the lockingfinger passing across the pivot finger and the blade when the pivotfinger is inserted into the blade aperture wherein the blade and pivotfinger are located between the locking finger and the attachment arm,the locking finger biased towards the attachment arm to secure the bladeonto the pivot finger.
 5. The system of claim 3 wherein the verticalheight of the retention aperture is greater towards the blade than thecenter of the attachment arm.
 6. The system of claim 5 wherein at leasta portion of the locking finger, the blade, and the attachment arm arelocated within the retention aperture wherein the retention bodyencompasses at least a portion of the attachment arm, the blade, and thelocking body.
 7. A rotary mower blade system attachable to a spindle ofa lawnmower, the system comprising: an attachment arm extending along alongitudinal axis; a first retention body configured to accept a firstblade; a second retention body configured to accept a second blade; aretention aperture of the retention bodies wherein at least a portion ofthe attachment arm passes longitudinally through the retention aperture;the first blade inserts into the retention aperture of the firstretention body to secure the first blade to the attachment arm whereinboth the first blade and the attachment arm are secured within theretention aperture; the second blade inserts into the retention apertureof the second retention body to secure the second blade to theattachment arm wherein both the second blade and the attachment arm aresecured within the retention aperture; a first pivot finger extendingvertically from the attachment arm, the first pivot finger contactingthe first blade to secure the first blade to the attachment arm; asecond pivot finger extending vertically from the attachment arm, thesecond pivot finger contacting the second blade to secure the secondblade to the attachment arm; a locking body secured to the attachmentarm; a locking finger of the locking body that is vertically displacedfrom the attachment arm, the locking finger extending longitudinallyacross the first pivot finger such that the first pivot finger islocated between the attachment arm and the locking finger.
 8. The systemof claim 7, the blade further comprising: a pivot aperture of the firstblade wherein the pivot finger passes vertically through the firstblade; the first blade secured between the attachment arm and thelocking finger wherein the pivot finger passes through the pivotaperture of the first blade to secure the first blade to the attachmentarm, the locking finger biased towards the attachment arm to contact thepivot finger to pivotally secure the first blade.
 9. The system of claim8 further comprising: an outer surface of the blade wherein the outersurface is curved, the curved surface located near the pivot aperture ofthe first blade wherein the pivot aperture is located near alongitudinal end of the blade.
 10. The system of claim 8 furthercomprising: a first end of the retention aperture having a firstvertical height; a second end of the retention aperture having a secondvertical height that is greater than the first vertical height, whereinthe first end and the second end are longitudinally spaced apart, thefirst end located towards the center of the attachment arm, wherein theblade and the locking body when attached to the attachment arm can passinto the second end and the first vertical height of the first endlimits the blade and the locking body from passing through the firstend; the retention body encompassing at least a portion of theattachment arm, the blade, and the locking finger to secure the firstblade to the attachment arm.